Crassulacean Acid Metabolism in Three Species of the C4 Genus Portulaca

  title={Crassulacean Acid Metabolism in Three Species of the C4 Genus Portulaca},
  author={Anthony A. Kraybill and Craig Edwin Martin},
  journal={International Journal of Plant Sciences},
  pages={103 - 109}
The putative existence of Crassulacean acid metabolism was investigated in three succulent species of the C4 genus Portulaca: P. grandiflora (a widely cultivated species), P. oleracea (a cosmopolitan weed), and P. mundula (found on rock outcrops throughout the southwestern United States). Patterns of diurnal conductance and CO2 exchange, as well as diurnal tissue malic acid fluctuations, were measured in plants under well-watered and drought-stressed conditions. Net CO2 uptake in both… 
Does the C4 plant Trianthema portulacastrum (Aizoaceae) exhibit weakly expressed crassulacean acid metabolism (CAM)?
Trianthema becomes the second genus of vascular land plants in which C4 and features of CAM have been demonstrated to co-occur in the same plant and the first C4 plant with CAM-type acidification described for the Aizoaceae.
A phylogenetic view of low-level CAM in Pelargonium (Geraniaceae).
A survey for CAM across Pelargonium is presented, emphasizing theWinter rainfall clade, predominantly from the winter rainfall region of southern Africa, likely proliferated in response to Miocene or Pliocene aridification.
The Occurrence and Phylogenetics of Crassulacean Acid Metabolism in the Portulacaceae
The phylogenetic and physiological data in the Portulacaceae indicate a scheme for the evolution of CAM, possibly starting with changes in leaf anatomy, then progressing to increased enzyme activity with increased acid fluctuations, and finally ending with the development of the full CAM pathway.
Photosynthetic and anatomical characteristics in the C4crassulacean acid metabolism-cycling plant Portulaca grandiflora.
Results demonstrate, for the first time, that the stem of P. grandiflora is an inducible CAM-idling tissue, and indicate that the C4 and CAM pathways operate independently of one another in P.grandiflorA.
Induction of a Crassulacean acid like metabolism in the C4 succulent plant, Portulaca oleracea L.: physiological and morphological changes are accompanied by specific modifications in phosphoenolpyruvate carboxylase
The results presented suggest that PEPC activity and regulation are modified upon drought stress treatment in a way that allows P. oleracea to perform a CAM-like metabolism.
The Development of Crassulacean Acid Metabolism (CAM) Photosynthesis in Cotyledons of the C4 Species, Portulaca grandiflora (Portulacaceae)
It appears both pathways develop simultaneously in the cotyledons but the CAM pathway, due to anatomical constraints, may be slower to develop than the C4 pathway.
Facultative crassulacean acid metabolism (CAM) in four small C-3 and C-4 leaf-succulents
Measurements of whole-plant gas exchange and titratable acidity demonstrate that the Australian native species Anacampseros australiana and the widespread naturalised tropical exotic, Portulaca pilosa L., exhibit facultative crassulacean acid metabolism (CAM), and that facultative CAM may be more common than previously suspected.
ptional use of CAM photosynthesis in two C 4 species , Portulaca yclophylla and Portulaca digyna oseph
Low levels of crassulacean acid metabolism (CAM) are demonstrated in two species with C4 photosynthesis, Portulaca cyclophylla and P. digyna. The expression of CAM in P. cyclophylla and P. digyna is
Photosynthetic Pathway Variation in Leafy Members of Two Subfamilies of the Cactaceae
The results of this study indicate that members of the Pereskioideae should be restricted to moister habitats or must restrict the timing of growth to wet seasons, whereas the observed combinations of the C3 and CAM pathways in the opuntioid taxa should prove beneficial in conserving water in the sporadically arid tropical and subtropical habitats of these plants.


Crassulacean Acid Metabolism in the Succulent C(4) Dicot, Portulaca oleracea L Under Natural Environmental Conditions.
Results substantiate earlier work with growth-chamber-grown plants and show that limited CAM activity can occur in the succulent C(4) dicot Portulaca oleracea L. Oleracea under certain natural environmental conditions.
Characteristics of Crassulacean Acid Metabolism in the Succulent C(4) Dicot, Portulaca oleracea L.
Results indicate that under certain conditions, such as water stress or short photoperiods, P. oleracea is capable of developing an acid metabolism with many similarities to CAM.
Carbon metabolism in two species of pereskia (cactaceae).
Water stress causes these cacti to shift to an internal CO(2) recycling ("idling") that has all attributes of Crassulacean acid metabolism except nocturnal stomata opening and CO(3) uptake.
Variability in Crassulacean Acid Metabolism: A Survey of North Carolina Succulent Species
The correlation between succulence and Crassulacean acid metabolism was investigated in 28 succulent species growing in various habitats throughout North Carolina, emphasizing that one photosynthetic pathway does not characterize all succulents in North Carolina.
Ecophysiological Significance of CO(2)-Recycling via Crassulacean Acid Metabolism in Talinum calycinum Engelm. (Portulacaceae).
High levels of variability in gas exchange characteristics and degree of CAM-cycling were found in the same and different individuals of Talinum calycinum Engelm, collected from rock outcrops in Missouri, indicating an important adaptation minimizing water loss by perennial succulents growing in shallow soil on rockOutcrops.
Correlation between CAM-Cycling and Photosynthetic Gas Exchange in Five Species of Talinum (Portulacaceae).
Evidence that CO(2) recycling via malic acid is negatively correlated with daytime transpirational water losses in well-watered plants is provided, suggesting that CAM-cycling could be important for survival in the thin, frequently desiccated soils of rock outcrops on which these plants occur.
Crassulacean Acid Metabolism and Crassulacean Acid Metabolism Modifications in Peperomia camptotricha.
Peperomia camptotricha, a tropical epiphyte from Mexico, shows variable forms of Crassulacean acid metabolism (CAM), and water stress caused a switch to CAM in young and mature leaves, and as water stress increased, they shifted to CAM-idling.
Leaf anatomy of species in some dicotyledon families as related to the C3 and C4 pathways of carbon fixation.
The specialization in leaf anatomy was noted in species of 24 genera and its presence is highly correlated with a habitat of limited water availability and (or) with a tropical origin.
The role of crassulacean acid metabolism (CAM) in the adaptation of plants to salinity.
  • U. Lüttge
  • Environmental Science
    The New phytologist
  • 1993
Two case studies are presented illustrating how the behaviour of plants using crassulacean acid metabolism (CAM) provides adaptation to salinity. Perennial cacti having constitutive CAM show
Crassulacean Acid Metabolism
Plants with crassulacean acid metabolism (CAM) are rarely the most abundant in plant communities, and rarely attain high biomass, but they are capable of an extraordinary array of physiological